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H334 — May cause allergy or asthma symptoms or breathing difficulties if inhaled

Hazard class: Respiratory sensitization · Category 1, 1A, 1B

93 substances with this hazard classification

What does H334 mean?

Inhalation may cause allergic respiratory reactions including asthma symptoms and breathing difficulties.

Safety Guidance

Avoid breathing dust, fume, gas, mist, vapours, or spray. Use only in well-ventilated areas. Wear respiratory protection. If experiencing respiratory symptoms, call a poison center or doctor.

Substances with H334

SubstanceCAS NumberSignal Word
(-)-4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one 31798-12-6 Danger
(4-aminophenylthio)acetic acid 104-18-7 Danger
(5α)-17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxymorphina... 16676-29-2 Danger
(5α)-4,5-epoxy-3,14-dihydroxy-17-methylmorphinan-6-one hydro... 357-07-3 Danger
(5α)-4,5-epoxy-3,14-dihydroxymorphinan-6-one 33522-95-1 Danger
(5α)-4,5-epoxy-3,14-dihydroxymorphinan-6-one hydrochloride 52446-24-9 Danger
(5α)-6,7,8,14-tetradehydro-4,5-epoxy-6-methoxy-17-methylmorp... 467-04-9 Danger
(5α,6α)-17-(cyclobutylmethyl)-4,5-epoxymorphinan-3,6,14-trio... 23277-43-2 Danger
(5α,6α)-7,8-didehydro-4,5-epoxy-17-methylmorphinan-3,6-diyl... 12040-41-4 Danger
(5α,6α)-7,8-didehydro-4,5-epoxy-3,6-dimethoxy-17-methylmorph... 2859-16-7 Danger
(5α,6β)-4,5-epoxy-3,6-dimethoxy-17-methylmorphinan 41714-53-8 Danger
(5α)-7,8-didehydro-4,5-epoxy-3,14-dihydroxymorphinan-6-one 84116-46-1 Danger
(5α)-7,8-didehydro-4,5-epoxy-3-hydroxy-17-methylmorphinan-6-... 467-02-7 Danger
(5α)-7,8-didehydro-4,5-epoxy-3-methoxy-17-methylmorphinan-6-... 467-13-0 Danger
(6R,7R)-7-Amino-8-oxo-3-vinyl-5-thia-1-aza-bicyclo[4,2,0]oct... 79349-82-9 Danger
(6R-trans)-3-(acetoxymethyl)-8-oxo-7-[2-(4-pyridylthio)aceta... 68121-47-1 Danger
(6R-trans)-3-(acetoxymethyl)-8-oxo-7-[2-(4-pyridylthio)aceta... 66163-79-9 Danger
(6R-trans)-7-[2-(2-aminothiazol-4-yl)acetamido]-3-[[[1-[2-(d... 66309-69-1 Danger
(6R-trans)-7-amino-3-[([5-(carboxymethyl)-4-methyl-2-thiazol... 111298-82-9 Danger
(6R-trans)-7-amino-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)thio]... 30246-33-4 Danger
(6R-trans)-7-amino-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]... 53994-69-7 Danger
(6R-trans)-7-amino-3-(hydroxymethyl)-8-oxo-5-thia-1-azabicyc... 15690-38-7 Danger
(6R-trans)-7-amino-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]... 22252-43-3 Danger
(6R-trans)-7-amino-8-oxo-3-[[(1,2,5,6-tetrahydro-2-methyl-5,... 58909-56-1 Danger
(6R-trans)-7-amino-8-oxo-3-[(1,3,4-thiadiazol-2-ylthio)methy... 24209-43-6 Danger
(8E,10E)-dodeca-8,10-dienol 33956-49-9 Danger
(8α,9R)-6'-methoxycinchonan-9-ol monohydrochloride 130-89-2 Warning
(8α,9S)-6'-methoxycinchonan-9-ol 572-60-1 Danger
(9R)-6'-methoxycinchonan-9-ol 572-59-8 Danger
(chloromethoxymethyl)benzene 35364-99-9 Danger
(endo,anti)-(±)-3-(3-hydroxy-1-oxo-2-phenylpropoxy)-8-isopro... 58073-59-9 Warning
(exo,syn)-(±)-3-(3-hydroxy-1-oxo-2-phenylpropoxy)-8-isopropy... 60251-88-9 Danger
(Isocyanatomethyl)(dimethoxy)methylsilane 406679-89-8 Danger
(isodecanoato-O)(isononanoato-O)nickel 84852-36-8 Danger
(isodecanoato-O)(isooctanoato-O)nickel 85166-19-4 Danger
(isononanoato-O)(isooctanoato-O)nickel 85508-46-9 Danger
(isononanoato-O)(neodecanoato-O)nickel 85551-28-6 Danger
(isooctanoato-O)(neodecanoato-O)nickel 84852-35-7 Danger
(methoxymethylene)malononitrile 672-81-1 Danger
(p-toluenesulphonyl)methyl isocyanide 36635-61-7 Danger
(R)-1-chloro-2,3-epoxypropane 51594-55-9 Danger
(-)-α-(chloroformyl)benzylammonium chloride 39878-87-0 Danger
(α-D-glucopyranosylthio)gold 12192-57-3 Danger